Amazing how many people still connect a mouse and keyboard to their laptops when they really want to get something done.
I'll grant you the mouse thing (I always carry a wireless mouse with me), but I never connect a keyboard...
... mainly because I never buy a laptop without a full keyboard, at least a 17" screen and the ability to run games Like WoW at fast speeds with a good frame rate. I still use the desktop when I get home though.

As you say, crippled keyboards like you find on most laptops and touchpads just don't cut it. The only reason I'm thinking of a tablet is because I travel so much and pulling my laptop out in the airport/plane is a pain. If I do take the plunge then it will be an i5 or i7 running Windows. Meanwhile, my Kindle Fire does quite well for non-work related stuff.